- Set up the apparatus as shown in the diagram and allow the weight to fall a height h.
- The length of twine fixed to the small mass should be equal to h, the original height of the small mass above the ground.
- Measure the time (t) it takes to hit the ground.
- Count the number of revolutions (N0) before the weight hits the ground and the further number of revolutions (Nf) before the flywheel comes to rest.
- Repeat the procedure several times and obtain mean values for all quantities.
- Measure the diameter of the axle (d) and record the mass of the falling weight (m)